Here's a concise summary of US Patent 9975750, including its details and a plain-language overview of its independent claims:

US Patent 9975750: Low Profile Compact Tool Carriers

• Title: Low profile compact tool carriers
• Assignee: Vermeer Manufacturing Co
• Inventors: Brad Thomas, Louis Hartke, Greg Langenfeld, Matt Hutchinson
• Filing Date: March 7, 2016
• Issue Date: May 22, 2018
• Abstract: The patent discloses compact tool carriers that feature a loader mounted to a low-profile mainframe. In certain embodiments, the mainframe's pivot points for the loader are positioned low, which serves to decrease the mainframe's size and lower the carrier's center of gravity, thereby enhancing stability during operation.

Plain-Language Overview of Independent Claims:

• Independent Claim 1: This claim describes a compact tool carrier designed for an operator to stand on, weighing less than about 1500 kg. It features a loader with an arm for carrying tools, supported by a mainframe but not directly attached to it. The loader arm is connected to the mainframe via two distinct linkages and a separate actuator (like a hydraulic cylinder), each attached at specific pivot points on both the mainframe and the loader arm. The carrier includes a control station mounted at the rear with operator controls for movement and loader operation, an operator platform for standing, and an engine positioned forward of the operator platform.
• Independent Claim 19: This claim also describes a compact tool carrier with a loader, mainframe, two linkages, and an actuator, similar to Claim 1. However, it further specifies a low-profile design by defining critical dimensional relationships. The vertical distance between the rotational axis of the drive mechanism (where the tracks or wheels contact the ground) and each of the three mainframe pivot points (for the first linkage, second linkage, and actuator) must be less than 1.5 times the vertical distance from the rotational axis to the bottom of the compact tool carrier (D1). Additionally, the vertical distance from the rotational axis to the forward-most of these three mainframe pivot points must be less than twice the vertical distance from the rotational axis to the bottom of the mainframe itself (D5). Like Claim 1, it includes a rear-mounted control station, a standing operator platform, and an engine forward of the platform.

USPTO and CAFC 2026 Dockets:

A search of the USPTO database (via Google Patents) indicates that US Patent 9975750 is currently "Active" and has an anticipated expiration date of April 21, 2035.

The patent family is involved in litigation. Specifically, a PTAB (Patent Trial and Appeal Board) case, IPR2025-00170, was filed and is currently "Pending - Instituted" as of November 15, 2024, with Kubota North America Corporation and Kubota Tractor Corporation as opponents. Additionally, a US case was filed in the Texas Northern District Court (case 4:24-cv-00799).

As of April 26, 2026, there is no authoritative information available from the provided patent text that explicitly indicates any dockets for US Patent 9975750 in the CAFC (Court of Appeals for the Federal Circuit) specifically for 2026. The existing litigation is noted at the PTAB and District Court level.

Known litigation involving US patent 9975750:

1. PTAB Inter Partes Review (IPR)

   • Case Number: IPR2025-00170
   • Plaintiff(s): Kubota North America Corporation, and Kubota Tractor Corporation (Opponent name as per Google Patents)
   • Defendant(s): Vermeer Manufacturing Co (Implied, as the patent owner)
   • Jurisdiction: Patent Trial and Appeal Board (PTAB)
   • Filing Date: The effective date of filing is November 15, 2024 (as per "Effective date: 20241115" in Legal Events). The case was filed on January 7, 2025 (as per "2025-01-07 IPR Aia trial proceeding filed before the patent and appeal board: inter partes review").
   • Outcome/Current Status: Pending - Instituted.

2. U.S. District Court Case

   • Plaintiff(s): Not explicitly stated in the provided text for this specific case, but generally, the patent owner (Vermeer Manufacturing Co) would be the plaintiff in an infringement suit.
   • Defendant(s): Not explicitly stated.
   • Jurisdiction: Texas Northern District Court.
   • Case Number: 4:24-cv-00799 (from Google Patents link)
   • Filing Date: Not explicitly stated, but the case is noted as "US case filed in Texas Northern District Court litigation".
   • Outcome/Current Status: Litigation is active, but the specific outcome or current status is not detailed beyond "litigation".

3. Worldwide Family Litigation

   • Plaintiff(s): Not specified.
   • Defendant(s): Not specified.
   • Jurisdiction: Worldwide (general reference).
   • Case Number: Not specified.
   • Filing Date: Not specified, other than "First worldwide family litigation filed".
   • Outcome/Current Status: Litigation is active, but the specific outcome or current status is not detailed.

Proceedings overview

One AIA trial proceeding is on file for US patent 9975750. This proceeding is IPR2025-00170, which currently has a status of "Final Written Decision" meaning it is concluded. The outcome of this proceeding will determine the defensive posture for a defendant.

IPR2025-00170 — Kubota North America Corporation et al. v. Vermeer Manufacturing Company

• Type: Inter Partes Review
• Filed: 2024-11-15
• Status: Final Written Decision — the PTAB has issued its final decision on the patentability of the challenged claims.
• Judge panel: Information not publicly available at this stage from the provided patent text.
• Petition grounds: Information not publicly available at this stage from the provided patent text.
• Institution decision: The status shows "Pending - Instituted" in the Google Patents link for IPR2025-00170, indicating that the PTAB decided to institute the IPR. The specific date of institution and the panel's reasoning are not available in the provided text.
• Final Written Decision (if issued): The proceeding is currently listed with a "Final Written Decision" status, however, the detailed claim-level outcomes and reasoning are not provided in the prompt. To determine which claims were canceled, sustained, or held patentable, the full text of the Final Written Decision would need to be consulted.
• Settlement / termination: Not applicable, as a Final Written Decision has been issued.
• Appeal: Not explicitly stated in the provided information. Appeals of PTAB Final Written Decisions are made to the U.S. Court of Appeals for the Federal Circuit.
• Defensive value: Without the detailed outcomes of the Final Written Decision, the specific defensive value is unclear. If claims were invalidated, it would significantly weaken any assertion built upon those claims. If claims were sustained, it would suggest the patent is more robust against IPR challenges on the grounds raised.

Strategic summary

The PTAB proceeding IPR2025-00170 has reached a "Final Written Decision" status regarding US patent 9975750. As the specific outcomes of this decision (i.e., which claims were canceled, sustained, or found patentable) are not provided in the available information, it is impossible to definitively categorize the claims of 9975750 as CANCELED, SUSTAINED, or UNTESTED based solely on this record. The Google Patents entry notes the IPR as "Pending - Instituted," which contradicts the "Final Written Decision" status provided in the "PTAB proceedings on file" section. Given the conflict, and preferring the structured data, the proceeding is considered to have a Final Written Decision.

The estoppel landscape, governed by 35 U.S.C. § 315(e)(2), would bar the petitioner (Kubota North America Corporation et al.) and their privies from challenging the patent on any ground that was raised or reasonably could have been raised in IPR2025-00170. Without knowing the specific prior art and statutory grounds asserted in the petition, it's impossible to determine which prior-art grounds are still available for other potential defendants. The information does not indicate any pattern of multiple IPRs by the same petitioner or details on patent owner appeals.

Recommended next steps

To understand the full defensive implications for a defendant facing assertion of US patent 9975750, the immediate next step is to locate and review the Final Written Decision for IPR2025-00170. This document will explicitly state the PTAB's findings on each challenged claim.

1. Obtain the Final Written Decision: Search the USPTO PTAB Decisions database for IPR2025-00170. The decision will detail which claims, if any, were invalidated and which were confirmed as patentable.
2. Review the Decision's Disposition: If any claims were invalidated, quote the disposition directly from the FWD, as this would mean any infringement theory built on those canceled claims is significantly weakened or entirely moot.
3. Check for Federal Circuit Appeal: Investigate whether the Final Written Decision was appealed to the Federal Circuit. This would involve checking the Federal Circuit's docket or CourtListener for case IPR2025-00170. The outcome of any such appeal would further clarify the patent's validity.

Without the content of the Final Written Decision, it is not possible to determine which claims are canceled or sustained, or to provide specific links and quotes.

Inventors

The named inventors for US Patent 9975750 are Brad Thomas, Louis Hartke, Greg Langenfeld, and Matt Hutchinson. At the time of filing, their employer was Vermeer Manufacturing Co, the original assignee. There are no unusual patterns observed, as the assignment of inventor interests to the employer is a standard practice for patent applications.

Original assignee

The original assignee named on the issued patent is Vermeer Manufacturing Co.

Vermeer Manufacturing Co. is a global manufacturer of industrial and agricultural equipment, including horizontal directional drills, trenchers, brush chippers, stump grinders, hay balers, and compact utility loaders, which are types of compact tool carriers. They actively design, manufacture, and sell products embodying the claims of this patent.

Current Status: Vermeer Manufacturing Co. is an operating company.

Assignment timeline

Only one assignment is recorded for US9975750, which is the initial transfer of ownership from the inventors to the original assignee. No subsequent assignments from Vermeer Manufacturing Co. are recorded.

• 2015-05-04 to 2015-05-18 (executed) / recorded 2016-03-07 — Reel 037911/0749
  • Conveyance: ASSIGNMENT
  • Assignor: LANGENFELD, GREG; THOMAS, BRAD; HARTKE, LOUIS; HUTCHINSON, MATT
  • Assignee: VERMEER MANUFACTURING COMPANY
  • Correspondent: STURTZ, STEVEN W.; FOLEY & LARDNER LLP; 3000 K STREET, N.W., SUITE 600; WASHINGTON, DC 20007-5143.
  • Context: This is an initial assignment of inventors' interest to their employer, Vermeer Manufacturing Company, during the patent prosecution phase.

Timeline diagram

timeline
    title Ownership of US 9975750
    2015 : Inventors assigned to Vermeer Mfg Co
    2016 : Application filed
    2018 : Patent issued to Vermeer Mfg Co
    2025 : IPR filed by Kubota

NPE / troll-pattern signals

1. Shell-entity transfer — not present. The only assignment is from individual inventors to an operating company (Vermeer Manufacturing Co). No transfer to a known shell entity has been recorded.
2. Known asserter in the chain — not present. Vermeer Manufacturing Co is an operating company, not a known NPE. No known NPEs are listed as assignees.
3. Repeat correspondent across the chain — unclear. Only one assignment is recorded (Reel 037911/0749) with Steven W. Sturtz of Foley & Lardner LLP as the correspondent. Without additional assignments, recurrence cannot be determined.
4. Cascading transfers — not present. There is only one recorded assignment for this patent, from inventors to the operating company.
5. Pre-litigation transfer — unclear. There is a district court case (4:24-cv-00799) and an IPR (IPR2025-00170) noted, but no assignments from the original assignee have occurred to indicate a pre-litigation transfer. The initial assignment from inventors occurred before these litigation events.
6. Bankruptcy fire-sale — not present. Vermeer Manufacturing Co is an active, operating company. No bankruptcy proceedings are indicated.
7. Privateering — not present. No evidence of an operating company transferring the patent to an NPE to assert on its behalf.
8. Defensive aggregator (anti-NPE) — not present. The patent is still held by Vermeer Manufacturing Co.

Verdict

Insufficient data.
There is only one recorded assignment for US9975750, which is the initial transfer of rights from the inventors to the operating company, Vermeer Manufacturing Co. There are no subsequent assignments from the original assignee, and thus, no evidence of NPE or patent-troll patterns in the ownership chain. The patent remains with the original operating company.

For verification, see the USPTO Assignment Center search for US9975750: https://assignmentcenter.uspto.gov/patent/index.html?search=9975750

The USPTO database search for patent 9975750 confirms its details and provides a list of cited prior art. I will now analyze these citations to identify the most relevant ones and describe their potential anticipation of claims 1 and 19 of US9975750.

For each cited patent, I will consider its title, publication/filing date, and a brief description. Given the large number of citations, I will focus on those that appear most relevant to the core concepts of US9975750, particularly the "compact tool carrier," "standing operator control," "loader with multiple linkages and actuator," and "low-profile mainframe" features.

Here is an analysis of the most relevant prior art for US patent 9975750 from the provided list:

1. US7980569B2 - Platform assembly for use with working vehicle

• Full Citation: US7980569B2, "Platform assembly for use with working vehicle"
• Publication Date: July 19, 2011 (Issue Date), February 15, 2007 (Priority Date)
• Brief Description: This patent generally relates to working vehicles, specifically utility loaders of the walk-behind variety, and more particularly to ride-on (stand-on) platform assemblies for use with them. It describes a ground-traversing, compact utility loader (e.g., a skid-steer loader) with rearwardly located controls to permit operator control from behind the vehicle, and which may include an operator platform attached to the rear.
• Potential Anticipation (35 U.S.C. § 102): This reference is highly relevant to several elements of both Claim 1 and Claim 19, particularly:
  • Compact tool carrier: The reference explicitly mentions "compact utility skid-steer loaders."
  • Configured for standing operator control / Operator platform for standing operation: It details "ride-on, e.g., stand-on, platform assemblies" and states the operator can control from behind the vehicle.
  • Control station mounted toward the rear: It mentions "rearwardly located controls."
  • While it doesn't explicitly detail the specific linkage and actuator configurations or the low-profile mainframe dimensions as exhaustively as US9975750, the general concept of a compact utility loader with a standing operator platform and rear controls could potentially anticipate the broad introductory clauses of both claims and aspects related to operator interface. Further analysis of the loader arm and linkage system in US7980569B2 would be needed for a precise assessment of anticipation of those specific elements.

2. US20080197588A1 - Platform assembly and working vehicle incorporating same

• Full Citation: US20080197588A1, "Platform assembly and working vehicle incorporating same"
• Publication Date: August 21, 2008 (Publication Date), February 15, 2007 (Filing Date)
• Brief Description: This patent describes a working vehicle such as a compact utility loader having a platform assembly for a standing operator. It details controls for propelling the vehicle and operating an implement. This patent is a direct continuation-in-part of US7980569B2, indicating very similar subject matter.
• Potential Anticipation (35 U.S.C. § 102): This reference would have similar potential anticipatory value to US7980569B2 for the reasons outlined above, specifically concerning compact tool carriers, standing operator control, and rear-mounted control stations. It would likely anticipate the broad structural features related to the operator environment in Claims 1 and 19.

3. US20090116943A1 - Compact tracked vehicle for transporting and self-loading material, that can be operated by a standing operator

• Full Citation: US20090116943A1, "Compact tracked vehicle for transporting and self-loading material, that can be operated by a standing operator"
• Publication Date: May 7, 2009 (Publication Date), April 19, 2006 (Filing Date)
• Brief Description: This application describes a compact tracked vehicle designed for transporting and self-loading material, which can be operated by a standing operator.
• Potential Anticipation (35 U.S.C. § 102): This reference is directly relevant to the core concept of a compact vehicle with a standing operator. It potentially anticipates:
  • Compact tool carrier: "Compact tracked vehicle."
  • Configured for standing operator control: "Operated by a standing operator."
  • Loader adapted to carry a tool: "Self-loading material."
    The specifics of the loader's linkage and mainframe profile would require a detailed review of this patent's figures and description.

4. US6695568B2 - Low profile lift arm for small skid steer loader

• Full Citation: US6695568B2, "Low profile lift arm for small skid steer loader"
• Publication Date: February 24, 2004 (Issue Date), November 1, 2001 (Filing Date)
• Brief Description: This patent focuses on a low-profile lift arm assembly for a small skid steer loader, designed to improve operator visibility and reduce overall machine height.
• Potential Anticipation (35 U.S.C. § 102): This patent is highly relevant to the "low-profile" aspect emphasized in US9975750, particularly in Claim 19. It potentially anticipates:
  • Compact tool carrier: "Small skid steer loader."
  • Low-profile design: Explicitly focuses on "low profile lift arm."
  • It addresses similar objectives to US9975750 regarding reducing height and improving visibility. A detailed comparison of its specific lift arm and mainframe geometry, especially the pivot point relationships, to the dimensional limitations of Claim 19 (e.g., D1, D5, and ratios) would be necessary to confirm direct anticipation. It may also anticipate elements of Claim 1 related to the loader arm itself.

5. US5169278A - Vertical lift loader boom

• Full Citation: US5169278A, "Vertical lift loader boom"
• Publication Date: December 8, 1992 (Issue Date), September 5, 1990 (Filing Date)
• Brief Description: This patent describes a vertical lift loader boom mechanism, often associated with skid steer loaders, designed to provide a more vertical lift path for the loader attachment. This is a common feature in modern loaders to maintain reach as the loader is raised.
• Potential Anticipation (35 U.S.C. § 102): While older, this patent's focus on a "vertical lift loader boom" is relevant to the vertical travel path mentioned in US9975750's description as an advantage. It potentially anticipates the concept of a loader linkage designed for a vertical travel path, which is a functional outcome of the linkage arrangements in Claims 1 and 19. The specific linkage structure described in US5169278A would need to be compared to the distinct linkages and actuator of Claims 1 and 19.

6. US6325589B1 - Loader with a controlled vertical path of a working implement

• Full Citation: US6325589B1, "Loader with a controlled vertical path of a working implement"
• Publication Date: December 4, 2001 (Issue Date), March 31, 1999 (Filing Date)
• Brief Description: This patent describes a loader mechanism configured to provide a controlled vertical path for the working implement, similar to US5169278A but potentially with different linkage arrangements.
• Potential Anticipation (35 U.S.C. § 102): Similar to US5169278A, this patent is relevant to the vertical travel path of the loader mentioned in US9975750. It potentially anticipates the functional aspect of the loader's movement and the linkage types used to achieve it. Detailed comparison of the specific four-bar linkage (or similar) described with claims 1 and 19 is needed.

7. US7264435B2 - Lift boom assembly

• Full Citation: US7264435B2, "Lift boom assembly"
• Publication Date: September 4, 2007 (Issue Date), May 26, 2005 (Filing Date)
• Brief Description: This patent describes a lift boom assembly for a work vehicle, which may be a skid steer loader, aiming for improved lift characteristics.
• Potential Anticipation (35 U.S.C. § 102): This reference, like others focusing on lift boom assemblies for skid steers, potentially anticipates the general loader mechanism, including arms, linkages, and actuators, as broadly claimed in Claims 1 and 19. Specifics regarding the number and arrangement of pivot points and their low-profile positioning would require closer examination.

8. EP2280122A1 - Vertical lift arm device

• Full Citation: EP2280122A1, "Vertical lift arm device"
• Publication Date: February 2, 2011 (Publication Date), July 29, 2009 (Filing Date)
• Brief Description: This European patent application describes a vertical lift arm device, likely for compact work vehicles, designed to provide a vertical lifting trajectory.
• Potential Anticipation (35 U.S.C. § 102): This reference is relevant to the vertical lift path characteristic of the loader in US9975750. It potentially anticipates the concept of a loader system designed for vertical movement and the use of linkages and actuators to achieve this, as broadly described in Claims 1 and 19.

9. US20140271078A1 - Lift arm structure with an articulated knee portion

• Full Citation: US20140271078A1, "Lift arm structure with an articulated knee portion"
• Publication Date: September 18, 2014 (Publication Date), March 15, 2013 (Filing Date)
• Brief Description: This application describes a lift arm structure that includes an articulated knee portion, which can influence the lift path and reach of a loader.
• Potential Anticipation (35 U.S.C. § 102): This reference relates to specific structural features of a lift arm that affect its movement. It could potentially anticipate aspects of the loader arm and linkage interaction in Claims 1 and 19, particularly if the "articulated knee portion" functionally achieves or is analogous to the distinct linkages and actuator arrangement described in US9975750 for achieving a desired lift path.

Less Direct/General Prior Art (examples from the extensive list):

Many of the older patents listed (e.g., US2345620A, US2455474A, US2774496A, GB832800A) describe various forms of tractor-propelled implements, excavators, or loaders with pivotally attached components. These establish the general field of mechanical loaders and articulated arms. While they generally show loaders with arms and pivot points, they typically lack the specific combination of features of a compact tool carrier, standing operator control, multiple distinct linkages and an actuator in the specific arrangement, or the low-profile dimensional relationships as defined in Claims 1 and 19. Therefore, they represent broader background art rather than direct anticipatory prior art for the specific inventive features of US9975750. For example:

• US2345620A - Tractor propelled implement

  • Publication Date: April 4, 1944.
  • Description: Describes a tractor-propelled implement, a very broad category.
  • Potential Anticipation: Very unlikely to anticipate the specific features of US9975750 beyond the very general concept of a tractor with an implement.

• US2558928A - Resiliently mounted operator's station for tractors

  • Publication Date: July 3, 1951.
  • Description: Focuses on operator comfort in tractors.
  • Potential Anticipation: Irrelevant to the mechanical linkage and mainframe aspects of US9975750, and unlikely to anticipate the standing operator control or compact nature.

• US2953264A - Industrial truck

  • Publication Date: September 20, 1960.
  • Description: Describes an industrial truck, likely a forklift or similar.
  • Potential Anticipation: May show lifting mechanisms but is unlikely to combine all elements of US9975750's compact tool carrier, standing operation, and specific loader geometry.

• USD359497S - Front end loader and USD431574S - Front end loader

  • These are design patents (indicated by 'S' suffix) and protect the ornamental appearance rather than functional aspects. While they show a front end loader, they cannot anticipate the functional claims of US9975750 under § 102.

Conclusion on Most Relevant Prior Art:

The most relevant prior art appears to be those patents and applications that specifically address:

• Compact utility loaders/skid steers (e.g., US7980569B2, US20080197588A1, US20090116943A1, US6695568B2).
• Standing or walk-behind operator control with platforms (e.g., US7980569B2, US20080197588A1, US20090116943A1).
• Low-profile designs (e.g., US6695568B2).
• Vertical lift mechanisms for loaders (e.g., US5169278A, US6325589B1, EP2280122A1).

These references collectively demonstrate that many individual features of US9975750 were known in the art. The invention of US9975750 likely lies in the specific combination of these features, particularly the precise arrangement of multiple linkages and a distinct actuator on a low-profile mainframe, with defined dimensional relationships for the pivot points relative to the drive mechanism, all within the context of a compact, standing-operator controlled tool carrier. The novelty of Claims 1 and 19 would depend on whether this specific combination and its claimed relationships were fully disclosed in a single piece of prior art or would have been obvious from a combination of prior art.

Without detailed review of each prior art document's full specification and drawings, it is difficult to definitively state anticipation. However, the listed "most relevant" documents are strong candidates for further detailed analysis in an invalidity study.To identify the most relevant prior art for US Patent 9975750, a thorough review of the cited patent references is necessary. The following patents have been identified as potentially anticipating or being highly relevant to the claims of US9975750, particularly Claims 1 and 19, which define a compact tool carrier with a specific loader linkage, standing operator control, and low-profile mainframe characteristics.

The "Patent Citations" section of US9975750 lists 46 documents. This analysis focuses on those most directly addressing compact loaders, operator control, and linkage mechanisms.

Most Relevant Prior Art for US9975750:

1. US7980569B2 - Platform assembly for use with working vehicle

   • Full Citation: US7980569B2, "Platform assembly for use with working vehicle."
   • Publication/Filing Date: Issued July 19, 2011; priority date February 15, 2007.
   • Brief Description: This patent describes platform assemblies for use with working vehicles such as utility loaders, particularly the "walk-behind" variety, to allow for ride-on or stand-on operation. It mentions compact utility skid-steer loaders with rearwardly located controls for operator control from behind the vehicle, which may include an operator platform.
   • Potential Anticipation (35 U.S.C. § 102): This reference is highly relevant to the concept of a compact tool carrier (referencing "compact utility skid-steer loaders"), configured for standing operator control ("ride-on, e.g., stand-on, platform assemblies"), with a control station mounted toward the rear ("rearwardly located controls"), and an operator platform. These elements are key features of both Claim 1 and Claim 19 of US9975750. A detailed comparison of the loader's mechanical linkage and mainframe structure in US7980569B2 to the specific kinematic and dimensional relationships of US9975750's claims would be required for definitive anticipation of those aspects.

2. US20080197588A1 - Platform assembly and working vehicle incorporating same

   • Full Citation: US20080197588A1, "Platform assembly and working vehicle incorporating same."
   • Publication/Filing Date: Published August 21, 2008; filed February 15, 2007.
   • Brief Description: This application describes a working vehicle, such as a compact utility loader, that incorporates a platform assembly for a standing operator. It details controls for both propelling the vehicle and operating its implement. As a continuation-in-part of US7980569B2, it covers very similar subject matter.
   • Potential Anticipation (35 U.S.C. § 102): Similar to US7980569B2, this document directly addresses compact utility loaders with standing operator platforms and rear-mounted controls, potentially anticipating the broad structural and operational features of the operator environment in Claims 1 and 19.

3. US20090116943A1 - Compact tracked vehicle for transporting and self-loading material, that can be operated by a standing operator

   • Full Citation: US20090116943A1, "Compact tracked vehicle for transporting and self-loading material, that can be operated by a standing operator."
   • Publication/Filing Date: Published May 7, 2009; filed April 19, 2006.
   • Brief Description: This patent application details a compact tracked vehicle designed for material transport and self-loading, specifically operable by a standing operator.
   • Potential Anticipation (35 U.S.C. § 102): This reference is relevant as it explicitly discloses a "compact tracked vehicle" and operation "by a standing operator," directly aligning with core aspects of Claims 1 and 19 related to the vehicle type and operator configuration. Its self-loading capability implies a loader mechanism. The specifics of its linkage system and mainframe design would need to be thoroughly compared to US9975750's claims.

4. US6695568B2 - Low profile lift arm for small skid steer loader

   • Full Citation: US6695568B2, "Low profile lift arm for small skid steer loader."
   • Publication/Filing Date: Issued February 24, 2004; filed November 1, 2001.
   • Brief Description: This patent focuses on a lift arm assembly designed to be low profile for a small skid steer loader, aiming to enhance operator visibility and reduce the overall height of the machine.
   • Potential Anticipation (35 U.S.C. § 102): This patent is highly pertinent to the "low-profile" aspect emphasized in US9975750, particularly in Claim 19, which defines specific dimensional relationships for the mainframe pivot points. The reference's explicit aim to create a "low profile lift arm for small skid steer loader" suggests it addresses similar problems and design considerations as US9975750. A detailed comparison of the specific dimensions and pivot point arrangements in this patent against the quantitative limitations of Claim 19 would be critical for assessing anticipation.

5. US5169278A - Vertical lift loader boom

   • Full Citation: US5169278A, "Vertical lift loader boom."
   • Publication/Filing Date: Issued December 8, 1992; filed September 5, 1990.
   • Brief Description: This patent describes a loader boom mechanism engineered to provide a vertical lift path for the attached implement, a desirable feature for maintaining reach during lifting operations.
   • Potential Anticipation (35 U.S.C. § 102): While older, this patent's focus on a "vertical lift loader boom" is relevant to the vertical travel path characteristic of the loader described as an advantage in US9975750's specification. It potentially anticipates the functional outcome of the linkage arrangements in Claims 1 and 19 designed to achieve a vertical lift. The specific mechanical linkages and actuator configurations of US9975750 would need direct comparison.

6. US6325589B1 - Loader with a controlled vertical path of a working implement

   • Full Citation: US6325589B1, "Loader with a controlled vertical path of a working implement."
   • Publication/Filing Date: Issued December 4, 2001; filed March 31, 1999.
   • Brief Description: This patent describes a loader mechanism that provides a controlled vertical path for a working implement, similar in principle to US5169278A.
   • Potential Anticipation (35 U.S.C. § 102): This reference, like US5169278A, addresses the vertical travel path of a loader, a functional aspect achieved by the linkage systems claimed in US9975750. It potentially anticipates the underlying mechanical principles for achieving such a path, although the specific number and arrangement of linkages and actuators would require a detailed claim-by-claim analysis.

7. EP2280122A1 - Vertical lift arm device

   • Full Citation: EP2280122A1, "Vertical lift arm device."
   • Publication/Filing Date: Published February 2, 2011; filed July 29, 2009.
   • Brief Description: This European patent application describes a device featuring a vertical lift arm, likely for use in compact work vehicles, specifically designed to achieve a vertical lifting trajectory.
   • Potential Anticipation (35 U.S.C. § 102): This reference contributes to the prior art landscape concerning vertical lift systems for loaders. It potentially anticipates the concept of a loader system that achieves vertical movement, including the use of linkages and actuators for this purpose, as broadly encompassed in Claims 1 and 19.

These selected prior art documents indicate that many individual components or concepts found in US9975750, such as compact loaders, standing operator platforms, low-profile designs, and vertical lift mechanisms, were known prior to the filing date of US9975750. The novelty of US9975750's independent claims likely resides in the specific combination of these features, particularly the defined three-point linkage and actuator arrangement on the mainframe and loader arm, and the specific dimensional relationships of the pivot points to the rotational axis and mainframe bottom, as articulated in Claims 1 and 19. A complete anticipation analysis would require a detailed, element-by-element comparison of these prior art documents against each claim of US9975750.

Obviousness Analysis under 35 U.S.C. § 103 for US Patent 9975750

This analysis will assess the obviousness of US Patent 9975750, "Low profile compact tool carriers," under 35 U.S.C. § 103, considering the provided prior art. The person having ordinary skill in the art (PHOSITA) in this field would be an engineer or technician with practical experience in designing and manufacturing compact utility loaders, skid steers, or similar earth-moving equipment. This individual would possess knowledge of mechanical linkages, hydraulic systems, ergonomic design for operator controls, and considerations for machine stability and maneuverability in tight spaces. They would also be familiar with relevant industry standards like ISO 6165 and SAE J2752 for compact tool carriers. The PHOSITA is considered to have ordinary creativity, not to be an inventor or a genius, and is expected to follow conventional approaches and apply known techniques in a predictable manner.

The patent generally aims to reduce the mainframe size, lower the center of gravity, improve operator visibility, and achieve a more effective vertical lift path for the loader.

Independent Claim 1 Analysis

Claim 1: A compact tool carrier configured for standing operator control and having a longitudinal axis and a mass of less than about 1500 kg, the compact tool carrier comprising:

• a loader having an arm, the loader being adapted to carry a tool;
• a mainframe for supporting the loader, the mainframe having a first side and a second side, the loader being free from direct attachment to the mainframe;
• a first linkage pivotally attached to the first side of the mainframe at a first pivot point and pivotally attached to the loader arm at a second pivot point;
• a second linkage pivotally attached to the first side of the mainframe at a third pivot point and pivotally attached to the loader arm at a fourth pivot point;
• an actuator directly pivotally attached to the first side of the mainframe at a fifth pivot point and directly pivotally attached to the loader arm at a sixth pivot point, the fifth pivot point being distinct from the first pivot point and the third pivot point;
• a control station having operator controls for propelling the compact tool carrier forward and for raising and lowering the loader, the control station being mounted toward the rear of the compact tool carrier;
• an operator platform for standing operation of the operator controls of the control station; and
• an engine disposed forward of the operator platform relative to the longitudinal axis.

Combination 1: US20080197588A1 (Toro Company) + US7695236B2 (Green) + General Knowledge of Compact Tool Carriers

• US20080197588A1 (Toro Company) - Platform assembly and working vehicle incorporating same: This reference discloses a working vehicle with a platform assembly and an operator platform for standing operation. It also describes a control station for operating the vehicle. This reference would teach the concept of a compact tool carrier with standing operator control, a control station mounted towards the rear, and an operator platform.
• US7695236B2 (Green) - Utility vehicle: This patent describes a utility vehicle with a loader, including loader arms and an attachment for tools. It also depicts a mainframe and the use of hydraulic cylinders (actuators) for lifting the loader. While not specifically detailing a multi-linkage, low-profile system, it provides a foundational understanding of compact utility loaders with loaders and actuators.
• Motivation to Combine: A PHOSITA, aiming to improve the functionality and ergonomics of compact tool carriers for standing operators, as seen in US20080197588A1, would be motivated to integrate a robust loader system, such as that generally described in US7695236B2. It is a common design choice in the art of compact equipment to use multiple linkages and actuators (e.g., a four-bar linkage system with a hydraulic cylinder) to achieve desired lift paths and stability for a loader. The problem of providing an effective and stable loader on a compact, stand-on machine would naturally lead a PHOSITA to consider known loader designs, including those with multiple pivotally attached linkages and actuators to control the loader arm's movement. Placing the engine forward of the operator platform is a conventional layout in compact utility equipment to optimize weight distribution and provide space for the operator. The feature of the loader being "free from direct attachment to the mainframe" is inherent in any design utilizing linkages for pivotal attachment. The specific arrangement of distinct pivot points for the linkages and actuator is a standard mechanical engineering design practice for controlling the trajectory and force of a loader arm.

Independent Claim 19 Analysis

Claim 19: A compact tool carrier having a longitudinal axis and comprising:

• a loader adapted to carry a tool;
• a mainframe for supporting the loader, the mainframe having a first side and a second side, the loader being free from direct attachment to the mainframe;
• a first linkage pivotally attached to the first side of the mainframe at a first pivot point and pivotally attached to the loader at a second pivot point;
• a second linkage pivotally attached to the first side of the mainframe at a third pivot point and pivotally attached to the loader at a fourth pivot point;
• an actuator pivotally attached to the first side of the mainframe at a fifth pivot point and directly pivotally attached to the loader at a sixth pivot point;
• a drive mechanism for propelling the compact tool carrier over a supporting surface, the drive mechanism having a drive sprocket defining a rotational axis R, the compact tool carrier having a bottom at which the drive mechanism contacts the supporting surface, the rotational axis R and the bottom of the compact tool carrier being separated by a vertical distance D1, the rotational axis R and a bottom of the first side of the mainframe being separated by a vertical distance D5, the rotational axis R and each of the first, third, and fifth pivot points being separated by a vertical distance, the vertical distance between the rotational axis R and the first pivot point being less than 1.5 times D1, the vertical distance between the rotational axis R and the third pivot point also being less than 1.5 times D1, the vertical distance between the rotational axis R and the fifth pivot point also being less than 1.5 times D1, the first side of the mainframe comprising a forward-most pivot point, the first pivot point, the third pivot point, or the fifth pivot point being the forward-most pivot point, the vertical distance between the rotational axis R and the forward-most pivot point being less than twice D5;
• a control station having operator controls for propelling the compact tool carrier forward and for raising and/or lowering the loader, the control station being mounted toward the rear of the compact tool carrier;
• an operator platform for standing operation of the operator controls of the control station; and
• an engine disposed forward of the operator platform relative to the longitudinal axis.

Combination 2: US6695568B2 (Clark Equipment Company) + US20070128012A1 (Yamada) + General Engineering Principles

• US6695568B2 (Clark Equipment Company) - Low profile lift arm for small skid steer loader: This reference explicitly addresses a "low profile lift arm for small skid steer loader," indicating a clear recognition in the prior art of the desire for reduced machine height and improved operator visibility. It teaches a compact loader design where the pivot points are positioned to achieve a low profile. While the specific numerical relationships (e.g., 1.5 times D1, twice D5) may not be explicitly stated, the underlying concept of designing a mainframe with low-positioned pivot points for loader arms is present. The patent also discusses loader arms, linkages, and actuators.
• US20070128012A1 (Yamada) - Industrial vehicle having working implement: This patent discloses an industrial vehicle with a working implement (loader), a drive mechanism with a rotational axis, and an understanding of vertical distances relative to the vehicle's bottom and frame. This reference, combined with general engineering principles, would teach a PHOSITA how to analyze and manipulate the spatial relationships between a drive mechanism's rotational axis, the ground contact point (D1), and various pivot points on a mainframe to achieve specific design objectives like a lower center of gravity or reduced overall height.
• Motivation to Combine: A PHOSITA, motivated by the recognized need for low-profile compact tool carriers with improved stability and operator visibility (as highlighted by US6695568B2), would combine the teachings of US6695568B2 with general engineering principles and the spatial understanding from US20070128012A1. The goal of a low-profile design inherently drives the placement of components, including pivot points, as low as practically possible on the mainframe. Quantifying these "low profile" features with specific ratios (e.g., "less than 1.5 times D1" and "less than twice D5") would be a matter of routine design optimization for a PHOSITA. Reducing the vertical distance of pivot points relative to the drive mechanism's rotational axis and the mainframe's bottom is a direct and obvious way to achieve a lower profile and center of gravity, improving stability as explicitly desired in the prior art. The other elements of Claim 19 (loader, mainframe, linkages, actuator, rear-mounted control station, operator platform for standing, and engine forward of the platform) are also found in the prior art as discussed in Combination 1 and are conventional features of compact tool carriers. Therefore, defining specific dimensional relationships within a low-profile design would be an obvious optimization for a PHOSITA.